Oil composition, etc.



Patented Apr. 1, 1930 STATES ATELNT OFFICE WALTER W. EVANS, OFLONGMEADOW, MASSACHUSETTS, ASSIGNOR TO B. T. VATTDEB- BILT COMPANY,INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK No'Drawing.Original application filed September 23, 1927, Serial No. 221,623.Divided and this application filed December 26, 1928. Serial N0.328,623.

This invention relates to improvements in oil and grease compositionsand to a treatment of mineral oils and greases to give compositions ofgreater stability than ordinary oils and greases.

This case is a division of my prior application Serial No. 221,623,filed September 23, 1927.

According to the present invention, there is added to and compoundedwith a mineral oil or grease composition a small amount of analkylenediaryldiamine, for example othylenediplienyldiamine. Theaddition of a small amount of such a product materially improves theageing properties of the composition and retards deterioration thereofat high temperatures, while under the influence of an electrical currentor when exposed to the action of the air, especially at hightemperatures. \Vhen mineral oil lubricants, for example, are used ininternal combustion engines, the high temperature to which the oils aresubjected results in more or less rapid deterioration with loss oflubricating properties, particularly where air comes in contact with theoils at the same time that they are subjected to heat and the oilsundergo more or less decomposition with the attendant formation ofcarbon or sludge-like ingredients. The addition of a small amount of analkylenediaryldiamine to such a lubricating oil tends to stabilize oiland retard deterioration.

In the case of transformer oils, the addition of a small amount of analkylene diaryl diamine increases the period ofusefulness of the oil andprevents or retards its deterioration. By preventing orretarding thedeterioration, the oil may be used over a greater period of time and theexpense of frequent replacement, etc, is eliminated. The saving in oilis appreciable and there is a further saving incident to the use of agood grade of oil rather than a partially decomposed oil.

Oils used for saturating cable wrappings are kept at high temperatureover a long period of time in a saturating bath, during saturation ofthe wrapping, which produces deterioration, and further deteriorationresults from the electrical stresses set up when the cablev is in use.The addition of a small amount of an alkylene diaryl diamine stabilizesthe saturating oil, giving it longer life and increasing its ctliciencyas an insulator.

The stabilizing agents which are added in small amounts to oil or greasecompositions, according to my invention, are alkylenediaryldiamines. Thealkylene diaryl diamines can be obtained by the condensation of alkylenedihalides such as ethylene dichloride with aromatic amines such asaniline, etc. Other alkylcne halides containing more than two carbonatoms in the alkylene group can be condensed with aniline or with otheraromatic amines, while ethylene dichloride can also be condensed withother aromatic amines besides aniline, for example, toluidine,naphthylanline, etc.

The alkylenediaryldiamine is employed in oil compositions in smallamounts usually less than one percent, for example from 0.2 to0.5',-,.although the amount can be increased or decreased.

For example, 0.5% of ethylene-di-paratolyl-diamine is gradually added toa refined mineral oil of specific gravity of 0.915 such as is used forinsulating cable wrappings of high voltage cabh's. The oil is heated andis stirred sufficiently to insure uniform solution of the amine in theoil. The treated oil has improved properties as a saturant for cablewrappings.

The action of the alkylenediaryldiamines as stabilizing agents issomewhat obscure but apparently their value lies in the fact that theyretard oxidation at elevated temperatures or under electrical conditionsto which oil or grease compositions may be subjected in use andparticularly where air or oxygen comes into contact with the oil orgrease composition.

I claim:

1. A mineral oil or grease composition comprising hydrocarbon oils orgreases and a fraction of a per cent of an alkylenediaryldiamine.

2. A hydrocarbon composition of mineral origin and a small amount of analkylenediaryldiamine admixed therewith.

3. A mineral oil or grease which is in tended for use under conditionslending to accelerate deterioration whichcontains an mixed therewith.

In testimony whereof I affix'my'signature.

WALTER W. EVANS.

